TCP Cubic keeps a metric that estimates the amount of delayedacknowledgements to use in adjusting the window. If an abnormallylarge number of packets are acknowledged at once, then the updatecould wrap and reach zero. This kind of ACK could onlyhappen when there was a large window and huge number ofACK's were lost.

This patch limits the value of delayed ack ratio. The choice of 32is just a conservative value since normally it should be range of 1 to 4 packets.